An astronomical telescope is made with lenses of focal length 80.0 cm and 2.00 cm. Two stars in the sky are separated by 
What angle of separation do they have when viewed in the telescope?
A. 
B. 
C. 
D. 
E. 
C.
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Poor clusters
a. contain more than 1000 stars and are found in the halo of the galaxy. b. contain lots of young stars and are found in the disk of a spiral galaxy. c. contain more than 1000 galaxies and are generally elliptical in shape. d. contain fewer than 1000 galaxies and tend to be irregularly shaped. e. are found in the nucleus of the galaxy.
The paths of the planets in the sky are tilted with respect to the celestial equator by about
A. 23 degrees. B. 5 degrees. C. 90 degrees. D. 45 degrees.
A rigid cylinder (15 cm radius, 15 cm height) contains nitrogen gas 
at standard temperature and pressure. What heat input is required to increase the average translational kinetic energy of the nitrogen molecules by 15%?
A. 150 J B. 130 J C. 260 J D. 86 J E. 51 J F. 77 J
The two most plentiful elements in the universe are
A) hydrogen and oxygen. B) nitrogen and helium. C) carbon and oxygen. D) lithium and helium. E) hydrogen and helium.